Gas production from Alberta＇s Leduc-age reservoirs, which originally contained more than 400 x 10(9)m(3) OGIP, has and will continue to be significant. Estimating recoveries from these bottom-water drive pools has been difficult. Recoverable reserves are dependent upon both the trapped gas saturation and aquifer performance. Generalizing core displacement tests and applying limited field experience has been problematic. With a number of projects reaching maturity it is now possible to integrate core displacement data and field performance to clarify the factors that control gas recovery in these pools. This study is able to demonstrate the dependence of trapped gas saturation on a number of factors including wettability, initial fluid saturation and permeability. A simple analytical model was developed to estimate and interpret blowdown recoveries from these pools. The actual performance of a suite of Leduc-age pools has been interpreted and applied to validate the model＇s applicability.